Re: Confounders and Coincidences

[BERNARD L COHEN <blc+@PITT.EDU>]

On Thu, 8 May 2003 epirad@mchsi.com wrote:



>

> Yes, using ecologic data to control confounding is helpful sometimes.  In

> fact, it does help especially if there are not large inter and intra county

> non linear effects.  However, we know without question that these non linear

> sources of confounding and effect modification exist in Dr. Cohen's data.



	--If there is a problem, please give me a concrete numerical

example (made-up is fine).



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